<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>CSS-position-static</title>
    <link rel="stylesheet" href="https://cdn.bootcss.com/normalize/8.0.0/normalize.css">
    <style>
        .container{
            background-color: #868686;
            width: 100%;
            height: 1000px;
        }
        .content{
            background-color: yellow;
            width: 100px;
            height: 100px;
            position: fixed;/* 这里使用了fixed */
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="content">    
        </div>
    </div>
</body>
</html>

